WO2016163526A1 - 反射型スクリーン、映像表示システム - Google Patents

反射型スクリーン、映像表示システム Download PDF

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Publication number
WO2016163526A1
WO2016163526A1 PCT/JP2016/061572 JP2016061572W WO2016163526A1 WO 2016163526 A1 WO2016163526 A1 WO 2016163526A1 JP 2016061572 W JP2016061572 W JP 2016061572W WO 2016163526 A1 WO2016163526 A1 WO 2016163526A1
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Prior art keywords
screen
reflective
lens
layer
reflective screen
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Application number
PCT/JP2016/061572
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English (en)
French (fr)
Japanese (ja)
Inventor
有希 桂
Original Assignee
大日本印刷株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 大日本印刷株式会社 filed Critical 大日本印刷株式会社
Priority to CN202011501228.0A priority Critical patent/CN112558405B/zh
Priority to CN201680018959.5A priority patent/CN107430326B/zh
Publication of WO2016163526A1 publication Critical patent/WO2016163526A1/ja

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/602—Lenticular screens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines

Definitions

  • the present invention relates to a reflective screen for displaying an image by reflecting projected image light, and an image display system.
  • the surface of the lens layer having a linear Fresnel lens shape or a circular Fresnel lens shape formed by arranging a plurality of unit lenses is used.
  • Various reflective screens and the like on which a reflective layer is formed have been developed (see, for example, Patent Documents 1 and 2).
  • the image light is reflected to the viewer side by reflection on the reflection layer formed on the surface of the lens layer. Therefore, the design of the angle (lens angle) between the lens surface of the lens layer and the screen surface is important for displaying a good image.
  • This lens angle is designed according to the position of the image projection device or the observer, the refractive index of the lens layer, and the like.
  • the image projection apparatus differs in the optimum position, projection distance, etc. with respect to the reflective screen depending on the model. In particular, since a short focus type image projection apparatus has a short projection distance, even a slight difference greatly affects image display. Therefore, in the reflection type screen as described above, conventionally, the lens angle has to be designed according to each video projection apparatus.
  • Patent Documents 1 and 2 do not disclose any degree of compatibility with a plurality of different video projection apparatuses as described above or improvement of uniformity.
  • An object of the present invention is to provide a reflective screen that can be used for a plurality of different short focus type image projection apparatuses and can display a good image with high uniformity, and an image display system including the same. .
  • a first invention is a reflective screen that reflects image light projected from an image source and displays the image light so as to be observable, and has a lens surface (112) and a non-lens surface (113), and is convex on the back side.
  • the reflective screen (10) is characterized by satisfying the following formula: 8 ⁇ r 3 ⁇ 3.572306333930145 ⁇ 10 ⁇ 5 ⁇ r 2 + 0.0422019282221293 ⁇ r ⁇ 0.54434381670028088 + 5.
  • a second invention is the reflective screen according to the first invention, wherein the unit lens (111) has a refractive index of 1.45 or more and 1.65 or less. It is.
  • a third invention is the reflective screen of the first or second invention, wherein the screen of the reflective screen is substantially rectangular, has a diagonal size of 100 inches, and an aspect ratio of 16: 9.
  • a reflective screen (10) characterized by the above.
  • the distance (S1) to (A) is a reflective screen (10) characterized by being 675 mm or more and 695 mm or less.
  • a fifth invention is a reflective screen according to any one of the first to fourth inventions, wherein the arrangement pitch of the unit lenses (111) is 50 ⁇ m or more and 1000 ⁇ m or less.
  • a sixth invention is a video display system (1) comprising: the reflective screen (10) of any one of the first to fifth inventions; and a video source (LS) that projects video light onto the reflective screen. ).
  • the video source (LS) is a display area of the reflective screen when viewed from the normal direction of the screen surface of the reflective screen (10).
  • the video display system (1) is characterized by being located on the same side as the center of the concentric circle.
  • ADVANTAGE OF THE INVENTION According to this invention, it can respond also to several different short focus type
  • FIG. 1 It is a figure showing picture display system 1 of an embodiment. It is a figure which shows the layer structure of the reflection type screen 10 of embodiment. It is a figure explaining the lens layer 11 of embodiment. It is a figure explaining the position of reflective screen 10, image source LS, etc. in image display system 1 of an embodiment. It is a graph which shows angle (alpha) of the reflection type screen 10 of an Example. It is a figure explaining the evaluation method of the brightness nonuniformity of the reflective screen of an Example.
  • FIG. 1 is the figure shown typically, and the magnitude
  • the terms “plate”, “sheet”, and the like are used, but these are generally used in the order of thickness, “plate”, “sheet”, “film”. Above all, it uses it. However, there is no technical meaning in such proper use, so these terms can be replaced as appropriate.
  • numerical values such as dimensions and material names of each member to be described are examples of the embodiment, and are not limited thereto, and may be appropriately selected and used.
  • FIG. 1 is a diagram showing a video display system 1 of the present embodiment.
  • FIG. 1A is a perspective view of the video display system 1
  • FIG. 1B shows the video display system 1 viewed from the side.
  • the video display system 1 includes a reflective screen 10, a video source LS, and the like.
  • the reflective screen 10 reflects the image light L projected from the image source LS and displays an image on the screen.
  • the video display system 1 can be used as, for example, a front projection television system.
  • the video source LS is a video projection device that projects the video light L onto a reflective screen, and is a short focus general-purpose projector or the like.
  • This video source LS is the center in the left-right direction of the screen of the reflective screen 10 when the screen (display area) of the reflective screen 10 is viewed from the front direction (normal direction of the screen surface) in the use state.
  • the screen is located on the lower side in the vertical direction than the screen of the reflective screen 10.
  • the video source LS can project the video light L from a position where the distance from the surface of the reflective screen 10 is significantly closer than that of a conventional general-purpose projector in the direction orthogonal to the screen.
  • the video source LS has a shorter projection distance to the reflective screen 10 and a larger incident angle of video light on the reflective screen 10 than a conventional general-purpose projector.
  • the screen surface indicates a surface in the planar direction of the reflection type screen 10 when viewed as the reflection type screen 10 as a whole, and is assumed to be parallel to the screen of the reflection type screen 10.
  • the reflective screen 10 reflects the image light L projected by the image source LS toward the observer O and displays an image.
  • the screen (display area) of the reflective screen 10 has a substantially rectangular shape in which the long side direction is the left-right direction of the screen when viewed from the observer O side.
  • the reflective screen has a large screen whose screen size is about 80 to 100 inches diagonal.
  • the reflective screen 10 of this embodiment has a screen (display area) size of 100 inches diagonal (2214 ⁇ 1245 mm) and a screen aspect ratio of 16: 9.
  • the screen vertical direction, screen horizontal direction, and thickness direction are the screen vertical direction (vertical direction), screen horizontal direction (horizontal direction) in the usage state of the reflective screen 10, It is assumed that it is in the thickness direction (depth direction). Further, the right side and the left side of the screen are the right side and the left side in the horizontal direction of the screen when viewed from the observer O located in the front direction of the reflective screen 10 unless otherwise specified.
  • the reflective screen is a laminated body of thin layers made of a resin, etc., and the screen itself often does not have sufficient rigidity to maintain flatness. Therefore, the reflective screen 10 of the present embodiment maintains the flatness of the screen by adopting a form in which the back surface of the reflective screen 10 is joined (or partially fixed) integrally with the support plate 50 via a joining layer (not shown). is doing.
  • the support plate 50 is a flat plate member having high rigidity, and a plate member such as a resin such as an acrylic resin or a PC resin, a metal such as aluminum, or a wooden plate can be used. Although it is preferable that the support plate 50 does not have light transmittance from the viewpoint of improving the appearance, etc., the support plate 50 may have light transmittance.
  • the support plate 50 is attached to the wall surface by a predetermined fixing member.
  • the fixing member can be appropriately selected and used.
  • the present invention is not limited to this, and the reflection type screen 10 may be configured such that its four sides are supported by a frame member (not shown) and the like so as to maintain its flatness.
  • FIG. 2 is a diagram showing a layer configuration of the reflective screen 10 of the present embodiment.
  • it passes through a point A (see FIGS. 1A and 1B) that is the screen center (the geometric center of the screen) of the reflective screen 10, is parallel to the vertical direction of the screen, and is on the screen surface.
  • a part of a cross section orthogonal (parallel to the thickness direction) is shown enlarged.
  • the support plate 50 and the like are omitted as appropriate for easy understanding.
  • the reflective screen 10 includes a surface layer 14, a base material layer 13, a lens layer 11, a reflective layer 12, and the like in order from the image source LS side (observer side).
  • the base material layer 13 is a sheet-like member having optical transparency.
  • the surface layer 14 is integrally formed on the observer side, and the lens layer 11 is integrally formed on the back side (back side).
  • the base material layer 13 is a layer that becomes a base material (base) for forming the lens layer 11.
  • the base material layer 13 has the light-diffusion layer 131 and the colored layer 132, and these are laminated
  • the base material layer 13 has an example in which the light diffusion layer 131 is located on the back side and the colored layer 132 is located on the viewer side (image source side). Not limited to this, the light diffusion layer 131 may be positioned on the viewer side, and the colored layer 132 may be positioned on the back side.
  • the light diffusion layer 131 is a layer containing a diffusion material that diffuses light using a light-transmitting resin as a base material, and has a function of diffusing light.
  • the light diffusion layer 131 has a function of widening the viewing angle and improving the in-plane uniformity of brightness.
  • PET polyethylene terephthalate
  • PC polycarbonate
  • MS methyl methacrylate / styrene
  • MBS methyl methacrylate / butadiene / styrene
  • acrylic resin TAC triacetyl cellulose
  • PEN polyethylene naphthalate
  • the diffusing material included in the light diffusing layer 131 acrylic resin, epoxy resin, silicon-based resin particles, inorganic particles, or the like can be used, and an inorganic diffusing material and an organic diffusing material are used. You may use it in combination. It is preferable to use a diffusing material having a substantially spherical shape and an average particle diameter of about 1 to 50 ⁇ m, and the range of the average particle diameter of the diffusing material more suitable for use is about 5 to 30 ⁇ m.
  • the light diffusion layer 131 has a thickness of about 100 to 2000 ⁇ m and a haze value of 85 to 99%, depending on the screen size of the reflective screen 10 and the desired optical performance. It is preferable from the viewpoint of suppressing image blur and obtaining in-plane uniformity with sufficient brightness.
  • the colored layer 132 is a layer colored to have a predetermined transmittance with a coloring material such as a dye or pigment such as gray or black.
  • the colored layer 132 has a function of improving the contrast of the image by absorbing unnecessary external light such as illumination light incident on the reflective screen 10 and stray light, or reducing the black luminance of the displayed image.
  • the resin used as the base material of the colored layer 132 include PET resin, PC resin, MS resin, MBS resin, acrylic resin, TAC resin, and PEN resin.
  • the colorant include dark dyes and pigments such as gray and black, and metal salts such as carbon black, graphite, and black iron oxide.
  • the colored layer 132 has a thickness of about 30 to 3000 ⁇ m and a transmittance of about 30 to 80%. Is preferable from the viewpoint of reducing the black luminance of the video image and displaying a bright video image.
  • the base material layer 13 can be formed by integrally laminating these layers by co-extrusion of the light diffusion layer 131 and the colored layer 132.
  • FIG. 3 is a diagram illustrating the lens layer 11 of the present embodiment.
  • FIG. 3A shows a state in which the lens layer 11 is observed from the front side on the back side, and the reflective layer 12 and the like are omitted for easy understanding.
  • FIG. 3B shows an enlarged part of the cross section shown in FIG.
  • the lens layer 11 is a light-transmitting resin layer provided on the back side of the base material layer 13.
  • the lens layer 11 has a unit lens 111 centered on a point C located outside the screen of the reflective screen 10 on the back side (the side opposite to the base material layer 13).
  • the circular Fresnel lens shape of the lens layer 11 is a circular Fresnel lens shape having a so-called offset structure with the point C as the center (Fresnel center). For this reason, as shown in FIG. 3A, when the lens layer 11 is viewed from the back side in the normal direction of the screen surface, a plurality of unit lenses 111 having a partially circular shape (arc shape) are arranged. Observe as.
  • the unit lens 111 is parallel to the direction orthogonal to the screen surface (thickness direction of the reflective screen 10) and in a cross section parallel to the arrangement direction of the unit lenses 111.
  • the cross-sectional shape is a substantially triangular shape.
  • the unit lens 111 is convex on the back side, and includes a lens surface 112 and a non-lens surface 113 that faces the lens surface 112 with the apex t interposed therebetween. In the usage state of the reflective screen 10, the lens surface 112 of the unit lens 111 is positioned above the non-lens surface 113 in the vertical direction with the apex t interposed therebetween.
  • the angle (lens angle) that the lens surface 112 makes with the surface parallel to the screen surface is ⁇
  • the non-lens surface 113 is a surface parallel to the screen surface.
  • the angle formed is ⁇ .
  • the angles ⁇ and ⁇ satisfy the relationship ⁇ > ⁇ .
  • the arrangement pitch of the unit lenses 111 is P
  • the lens height of the unit lenses 111 (the dimension from the apex t in the thickness direction of the screen to the point v that is the valley bottom between the unit lenses 111) is h.
  • FIG. 2 and the like show an example in which the arrangement pitch P and the angles ⁇ and ⁇ of the unit lenses 111 are constant in the arrangement direction of the unit lenses 111.
  • the unit lenses 111 according to the present embodiment actually have a constant arrangement pitch P, but gradually increase as the angle ⁇ becomes farther from the point C that becomes the Fresnel center in the arrangement direction of the unit lenses 111.
  • the arrangement pitch P of the unit lenses 111 of this embodiment can be set in the range of 50 to 1000 ⁇ m.
  • the lens height h increases as the distance from the point C increases in the arrangement direction of the unit lenses 111.
  • the arrangement pitch P may be gradually changed along the arrangement direction of the unit lenses 111, and the size of the pixel of the video source LS that projects the video light or the projection angle (reflection type) of the video source LS.
  • the incident angle of the image light on the screen surface of the screen 10), the screen size of the reflective screen 10, the refractive index of each layer, and the like can be changed as appropriate.
  • the lens layer 11 is formed of an ultraviolet curable resin such as urethane acrylate or epoxy acrylate.
  • the lens layer 11 is formed into a mold for shaping one surface of the base material layer 13 (in this embodiment, the surface on the light diffusion layer 131 side) into a circular Fresnel lens shape filled with an ultraviolet curable resin. It can be formed by, for example, an ultraviolet molding method in which it is pressed and cured by irradiating with ultraviolet rays and then released from the mold.
  • the unit lens 111 (lens layer 11) of this embodiment has a refractive index of 1.45 to 1.65.
  • the method for forming the lens layer 11 may be selected as appropriate and is not limited to this.
  • the lens layer 11 may be formed of other ionizing radiation curable resin such as an electron beam curable resin.
  • the lens layer 11 may use a thermoplastic resin, or may be formed by a press molding method or the like according to the Fresnel lens shape of the lens layer 11.
  • the base material layer 13 (light diffusion layer 131) or the like may be laminated on the image source side via a bonding layer (not shown) or the like.
  • the lens layer 11 and the base material layer 13 may be molded in an integrally laminated state.
  • the reflection layer 12 is a layer having an action of reflecting light.
  • the reflection layer 12 has a sufficient thickness for reflecting light, and is formed on at least a part of the lens surface 112 of the unit lens 111.
  • the reflection layer 12 of this embodiment is formed on the lens surface 112 and the non-lens surface 113 as shown in FIG. 2 and FIG. Specifically, the reflection layer 12 covers the back side of the lens layer 11 and is formed so as to fill the boundary between the unit lenses 111 that are convex on the back side, that is, the point v that becomes the valley bottom. Thereby, the reflection layer 12 can make the unevenness
  • the reflective layer 12 is formed by spray-coating the lens surface 112 with a paint (resin) containing a highly light-reflective scale-like metal thin film 12 a on the lens surface 112.
  • the reflective layer 12 has a surface perpendicular to the thickness direction of the scaly metal thin film 12a disposed substantially parallel to the lens surface 112, and the image light L incident on the lens surface 112 is appropriately directed to the viewer side. Can be reflected.
  • substantially parallel means not only the case where the surface perpendicular to the thickness direction of the metal thin film 12a is completely parallel to the lens surface 112, but also the inclination with respect to the lens surface 112 is in the range of ⁇ 10 ° to + 10 °. It includes things that include some cases.
  • the scale-like metal thin film 12a means that the shape (outer shape) viewed from the thickness direction is a scale-like shape, and this scale-like shape is not only a scale-like shape but also an elliptical shape or a circular shape. Polygonal shape, including an irregular shape obtained by pulverizing a thin film.
  • the reflection layer 12 preferably has a regular reflectance Rt of 50% ⁇ Rt ⁇ 70% and a diffuse reflectance Rd of 10% ⁇ Rd ⁇ 50%.
  • the metal thin film 12a of this embodiment is aluminum formed in a scale shape.
  • the thickness of the metal thin film 12a is formed in the range of 15 to 150 nm, more preferably in the range of 20 to 80 nm.
  • the metal thin film 12a has an average value of dimensions in the vertical and horizontal directions orthogonal to the thickness direction (hereinafter referred to as vertical and horizontal dimensions) equivalent to the lens height h of the unit lens 111, that is, 4 It is preferably formed to be 4 to 48.3 ⁇ m.
  • the equivalent to the lens height h is not only the case where the vertical dimension and the horizontal dimension of the metal thin film 12a are equal to the lens height h, but also when it approximates the lens height h (for example, with respect to the lens height h). -30% to + 30% size range).
  • the metal thin film 12a is disposed substantially parallel to the non-lens surface 113, when external light is incident on the non-lens surface 113, the external light is reflected by the non-lens surface 113 and reaches the observer side. In some cases, this causes a reduction in the contrast of the image. Therefore, by making the vertical dimension and the horizontal dimension of the metal thin film 12a equal to the lens height h as described above, when the paint is applied to the back side of the lens layer 11, the metal thin film 12a is not a lens. It can suppress arrange
  • the reflective layer 12 has a lens surface 112 at the center of the lens surface 112 in the arrangement direction of the unit lenses 111 from the viewpoint of ensuring the light reflection characteristics of the reflective layer 10 and maintaining the appearance of the back side of the reflective screen 10 in a satisfactory manner. It is desirable that the thickness (film thickness) in the direction perpendicular to is in the range of 8 to 15 ⁇ m. If the thickness of the reflective layer 12 is less than 8 ⁇ m, the reflectivity of the reflective layer 12 is lowered, and the image light may not be sufficiently reflected. Further, when the thickness of the reflective layer 12 is less than 8 ⁇ m, the reflective layer 12 exposed on the back side of the reflective screen 10 has a portion with and without a coating film, and the appearance is uneven or wrinkled.
  • the thickness of the reflective layer 12 is larger than 15 ⁇ m, a part of the metal thin film 12 a included in the reflective layer 12 is not arranged substantially parallel to the lens surface 112, and is partially approximately the lens surface 112. They are arranged vertically, and the appearance of the back side of the reflective layer 12 becomes uneven, which may impair the appearance of the back side of the reflective screen 10. Therefore, the thickness of the reflective layer 12 is preferably in the above range.
  • the surface layer 14 is a layer provided on the image source side (observer side) of the base material layer 13.
  • the surface layer 14 of the present embodiment forms the outermost surface of the reflective screen 10 on the image source side.
  • the surface layer 14 of the present embodiment has a hard coat function and an antiglare function, and an ultraviolet curable resin (for example, urethane acrylate) having a hard coat function on the surface of the base layer 13 on the image source side.
  • the ionizing radiation curable resin is applied so that the film thickness is about 10 to 100 ⁇ m and cured by transferring the fine uneven shape (mat shape) to the surface of the resin film, etc. Is shaped and formed.
  • the surface layer 14 is not limited to the above example, and one or more necessary functions such as an antireflection function, an antiglare function, a hard coat function, an ultraviolet absorption function, an antifouling function, and an antistatic function are appropriately selected. Can be provided. Further, a touch panel layer or the like may be provided as the surface layer 14. Further, the surface layer 14 may be provided with a layer having an antireflection function, an ultraviolet absorption function, an antifouling function, an antistatic function, or the like as a separate layer between the surface layer 14 and the base material layer 13.
  • the surface layer 14 is a layer separate from the base material layer 13 and may be bonded to the base material layer 13 by an adhesive material (not shown) or the like, and is opposite to the lens layer 11 of the base material layer 13. It may be formed directly on the side (video source side) surface.
  • the state of the image light L1 and the external lights G1, G2 incident on the reflective screen 10 of the present embodiment will be described.
  • the refractive index of the surface layer 14, the base material layer 13 (the colored layer 132, the light diffusion layer 131), and the lens layer 11 is assumed to be equal, and the image light L ⁇ b> 1 and the external light G are The light diffusing action of the light diffusing layer 131 is not shown.
  • most of the image light L1 projected from the image source LS enters from below the reflective screen 10, passes through the surface layer 14 and the base material layer 13, and is a unit lens of the lens layer 11. 111 is incident.
  • the video light L1 enters the lens surface 112, is reflected by the reflective layer 12, and exits from the reflective screen 10 toward the observer O side. Therefore, since the image light L1 is efficiently reflected and reaches the observer O, a bright image can be displayed.
  • the image light L1 is projected from below the reflective screen 10, and the angle ⁇ (see FIG. 3B) is larger than the incident angle of the image light L1 at each point in the vertical direction of the screen of the reflective screen 10. Therefore, the image light L1 does not directly enter the non-lens surface 113, and the non-lens surface 113 does not affect the reflection of the image light L1.
  • unnecessary external lights G1 and G2 such as illumination light are incident mainly from above the reflective screen 10 and transmitted through the surface layer 14 and the base material layer 13 as shown in FIG.
  • the light enters the lens 111.
  • a part of the external light G1 enters the non-lens surface 113, but is diffused at the end of the metal thin film 12a of the reflective layer 12 formed on the back side of the non-lens surface 113, and reaches the observer O side. Even so, the amount of light is much smaller than that of the image light L1.
  • a part of the external light G2 is reflected by the lens surface 112 and mainly travels to the lower side of the reflective screen 10, so that it does not reach the observer O side directly.
  • the reflective screen 10 of the present embodiment a bright and good image can be displayed even in a bright room environment.
  • FIG. 4 is a diagram for explaining the positions of the reflective screen 10, the video source LS, and the like in the video display system 1 of the present embodiment.
  • 4A shows a state in which the reflective screen 10 is observed from the normal direction of the screen surface
  • FIG. 4B is a cross section parallel to the screen vertical direction of the reflective screen 10 and perpendicular to the screen surface. The position of each part is shown.
  • the reflective screen 10 and the video display system 1 are shown in a simplified manner for easy understanding. As shown in FIG.
  • the straight line T is located on a plane M parallel to the screen surface.
  • the intersections of the perpendicular line drawn from the points A, B, and C onto the straight line T of the plane M and the plane M are defined as a point A1, a point B1, and a point C1, respectively.
  • the distance between point A and point C in the vertical direction of the screen ie, the distance between point A1 and point C1 on line T
  • the distance between point A and point B in the vertical direction of the screen ie , The distance between the points A1 and B1 on the straight line T
  • the dimension S1 and the dimension S2 satisfy the relationship of S1 ⁇ S2.
  • the reflective screen 10 passes through the point A, which is the geometric center of the screen on which an image is displayed, and is on the image source side of a straight line H orthogonal to the screen surface of the reflective screen 10 (
  • the image light L is reflected so as to be condensed at a condensing point F located at a position a predetermined distance away from the surface on the image source side of the reflective screen 10 in the front direction.
  • the reflective screen 10 is manufactured on the assumption that the observer O is located at the condensing point F and in the vicinity thereof.
  • the condensing point F of the reflective screen 10 of the present embodiment is on the image source side (observer side) of the straight line H shown in FIG. 4 and at a position 3 m from the image source side surface of the reflective screen 10.
  • the unit lens 111 is the screen size of the reflective screen 10, the position of the video source LS that projects video light onto the reflective screen 10, the projection angle of the video light, and the position of the condensing point F (that is, the observer O's position). Position), the refractive index of the unit lens 111 (lens layer 11), the distance from the point C serving as the Fresnel center of the circular Fresnel to the point where the unit lens 111 is located (radius r from the point C), etc. ⁇ is set. When a short-focus image source is used, the projection angle of the image light (the incident angle of the image light on the reflective screen) is large, and the incident angle of the image light at each position on the reflective screen changes greatly. ing. Therefore, the preferable lens angle ⁇ differs depending on each position of the reflective screen (radius r corresponding to the distance from the point C).
  • the reflection screen is designed with the lens angle and the like so as to be optimal for the image source to be used. Therefore, when different image sources are used even if they are the same short focus type, for example, moire occurs between the display pitch of the image of the image source and the unit lens, or sufficient light is incident on the condensing point F. It is not reflected, and the image quality is likely to be deteriorated, such as uneven brightness such as the peripheral edge of the screen (particularly the upper peripheral edge of the screen) becoming dark.
  • designing a reflective screen that is optimal for each video source leads to an increase in the production cost of the video display system and the reflective screen.
  • the reflection type screen 10 of the present embodiment is a lens located at a radius r from the point C, where r (mm) is the radius from the point C that is the Fresnel center of the circular Fresnel lens shape of the lens layer 11.
  • the angle (lens angle) ⁇ (°) formed by the surface 112 and a surface parallel to the screen surface satisfies the following equation (Equation 1).
  • the reflective screen 10 of the present embodiment can be widely applied to the short-focus image source LS. Therefore, it is not necessary to design the lens angle ⁇ required for each image source, and the production cost of the image display system and the reflective screen can be reduced.
  • the reflective screen 10 satisfying Equation 1 a reflective screen 10 that can display a good image with high uniformity, high contrast, and brightness, and can be used for a plurality of different short-focus image sources.
  • the video display system 1 can be obtained.
  • FIG. 5 is a graph showing the angle ⁇ in the reflective screen 10 of the example.
  • the vertical axis indicates the lens angle ⁇ (°)
  • the horizontal axis indicates the radius r (mm) from the point C.
  • the curve indicated by the alternate long and short dash line indicates Expression 3 shown below, and the broken line indicates Expression 4 shown below.
  • Formula 3 shows the upper limit of Formula 1 described above
  • Formula 4 shows the lower limit of Formula 1.
  • the reflective screen 10 of the example has a screen size of 100 inches diagonal (2214 ⁇ 1245 mm) and a screen aspect ratio of 16: 9.
  • the dimension S1 685 mm, which is the distance between the point A and the point C in the vertical direction of the screen of the reflective screen 10 of this embodiment.
  • the lens angle ⁇ (°) is approximated by the following expression 2.
  • Equation 2 is shown by a solid line in FIG.
  • the reflective screen 10 of the example satisfies the above-described formula 1 over the entire area of the screen.
  • the refractive index of the unit lenses 111 is 1.55, and the arrangement pitch P of the unit lenses 111 is 100 ⁇ m.
  • the surface layer 14 is made of an ultraviolet curable resin, has a thickness of 30 ⁇ m, and has a fine concavo-convex shape on the image source side surface thereof.
  • the colored layer 132 of the base material layer 13 has a thickness of 1500 ⁇ m and is made of an acrylic resin containing a black dye as a coloring material. The transmittance of the colored layer 132 is 59%.
  • the light diffusion layer 131 of the base material layer 13 has a thickness of 150 ⁇ m and is made of an acrylic resin containing a diffusion material having an average particle diameter of about 8 ⁇ m. The haze value of the light diffusion layer 131 is 85%.
  • the reflective layer 12 is made of urethane thermosetting resin containing scaly aluminum, and is formed on the lens surface and the non-lens surface.
  • the thickness of the reflective layer 12 is about 10 to 20 ⁇ m.
  • the regular reflectance Rt of this reflective layer 12 is 57%.
  • FIG. 6 is a diagram illustrating a method for evaluating luminance unevenness of the reflective screen 10 according to the embodiment.
  • FIG. 6 shows a state in which the reflective screen 10 and the observer O of the embodiment at the time of evaluation are viewed from the side surface side of the reflective screen 10.
  • Image light (white light) was projected from the four types of short-focus image sources LS on the reflective screen 10 of the example in a dark room environment.
  • the observer O is on the straight line H that passes through the geometric center of the screen of the reflective screen 10 of the embodiment and is perpendicular to the screen surface, and from the surface of the reflective screen 10 to the image source side (observer side). ),
  • the five image sources used are all commercially available short-focus projectors, and each image source displays an image of about 100 inches diagonal to the reflective screen described in each catalog. It is arranged at a position for projection.
  • the position of each image source with respect to the reflective screen 10 of the embodiment is as follows.
  • the dimension S3 is the distance from the surface of the reflective screen 10 in the normal direction of the screen surface to the reflection screen side end of the outline of each video source, and the dimension S4 is the outline of each video source in the vertical direction of the screen. This is the distance from the lower end to the lower end of the screen of the reflective screen 10 of the embodiment.
  • Each video source is arranged at the position as described above with respect to the reflective screen 10, and the video displayed on the screen of the reflective screen 10 (display area) has a diagonal of 97 to 100 inches ( The image light was projected so that the aspect ratio was 16: 9), and the luminance unevenness was evaluated.
  • the reflection type screen 10 of the example luminance unevenness such as the peripheral edge on the upper end side of the screen becoming dark is not observed regardless of the image source of any evaluation example, and the in-plane uniformity of brightness is sufficient. The uniformity was good. Still, the screen was bright enough. Therefore, according to the present embodiment, the reflection type screen 10 and the image display system 1 that can deal with different short-focus image sources and have good uniformity can be provided.
  • the reflective layer 12 is formed so as to cover the lens surface 112 and the non-lens surface 113 of the unit lens 111 has been described, but the embodiment is not limited thereto.
  • the reflective layer 12 may be provided only on the portion of the lens surface 112 that contributes to the reflection of the image light.
  • the reflective layer 12 since the reflective layer 12 is not formed on part of the lens surface 112 and the non-lens surface 113, it is necessary to provide a concealing layer (protective layer) that conceals the back side of the reflective layer 22.
  • the metal thin film 12a of the reflective layer 12 is not limited to aluminum, and other metals such as scale-like silver and nickel may be used.
  • the reflective screen 10 may be made of glass or resin, and may include a highly rigid transparent substrate layer.
  • the lens surface 112 and the non-lens surface 113 are planar as shown in FIG. 2 and the like.
  • the present invention is not limited thereto, and the lens surface 112 and the non-lens surface are not limited thereto.
  • a part of 113 may be curved.
  • the lens surface 112 and the non-lens surface 113 of the unit lens 111 may be configured such that at least one surface is composed of a plurality of surfaces, for example.
  • the unit lens 111 may have a substantially trapezoidal cross-sectional shape, and the lens surface and the non-lens surface face each other across a top surface parallel to the screen surface.
  • the top surface is preferably formed in a region that does not contribute to the reflection of the image light.
  • a reflective layer may be formed on the top surface, or the top surface may be covered with a concealing layer (protective layer).
  • the base material layer 13 showed the example provided with the colored layer 132 and the light-diffusion layer 131, not only this but the colored layer 132 is not provided, for example, but only the light-diffusion layer 131 is provided. It is good also as a form provided.
  • the light diffusion layer 131 may further include a colorant in addition to the diffusion material, or the lens layer may include a colorant.
  • the base material layer 13 is provided with the colored layer 132 and the light-diffusion layer 131, and the colored layer 132 is good also as a form which contains a light-diffusion material in addition to a coloring agent.
  • the light diffusing layer 131 and the colored layer 132 may be separately formed and joined with an adhesive or the like to form the base material layer 13.
  • the video source LS is positioned below the reflective screen 10 in the vertical direction and the video light L is projected obliquely from below the reflective screen 10.
  • the present invention is not limited to this.
  • the video source LS may be positioned above the reflective screen 10 in the vertical direction, and the video light L may be projected obliquely from above the reflective screen 10.
  • the reflective screen 10 may have a form in which a wall surface or the like is used as the support plate 50 and is joined by a joining layer. Further, the reflective screen 10 may be in a form that can be wound and stored when not in use. In the case of such a form, the support plate 50 or the like is not provided, and the back side of the reflective screen 10 is covered with a cloth or resin light-shielding curtain that hardly transmits light, a layer that improves scratch resistance, or the like. It is good.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Projection Apparatus (AREA)
PCT/JP2016/061572 2015-04-09 2016-04-08 反射型スクリーン、映像表示システム WO2016163526A1 (ja)

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JP7435095B2 (ja) 2020-03-18 2024-02-21 大日本印刷株式会社 反射スクリーン、反射スクリーンユニット及び映像表示装置
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CN115343909A (zh) * 2022-08-25 2022-11-15 青岛海信激光显示股份有限公司 一种投影屏幕及投影设备
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CN109917613B (zh) 2020-07-03
CN109917613A (zh) 2019-06-21
CN107430326B (zh) 2021-05-07

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